Core stretch A bag contains 30 balls, of which $x$ are black. After 6 black balls are removed, the

Question

Core stretch A bag contains 30 balls, of which $x$ are black. After 6 black balls are removed, the probability of black decreases by $\frac{1}{10}$. One ball is selected at random. Find $x$.

Accepted Answer

$x=18$.

Probability decrease after removing balls

Probability decrease after removing balls

Solution:

Solution locked